fennel.lua (1699B)
- -- Copyright 2006-2024 Mitchell. See LICENSE.
- -- Fennel LPeg lexer.
- -- Contributed by Momohime Honda.
- local lexer = require('lexer')
- local token, word_match = lexer.token, lexer.word_match
- local P, S = lpeg.P, lpeg.S
- local lex = lexer.new('fennel', {inherit = lexer.load('lua')})
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Keywords.
- lex:modify_rule('keyword', token(lexer.KEYWORD, word_match{
- '#', '%', '*', '+', '-', '->>', '->', '-?>>', '-?>', '..', '.', '//', '/', ':', '<=', '<', '=',
- '>=', '>', '?.', '^', '~=', 'λ', 'accumulate', 'and', 'band', 'bnot', 'bor', 'bxor', 'collect',
- 'comment', 'do', 'doto', 'each', 'eval-compiler', 'fn', 'for', 'global', 'hashfn', 'icollect',
- 'if', 'import-macros', 'include', 'lambda', 'length', 'let', 'local', 'lshift', 'lua', 'macro',
- 'macrodebug', 'macros', 'match', 'not', 'not=', 'or', 'partial', 'pick-args', 'pick-values',
- 'quote', 'require-macros', 'rshift', 'set', 'set-forcibly!', 'tset', 'values', 'var', 'when',
- 'while', 'with-open'
- }))
- -- Identifiers.
- local initial = lexer.alpha + S('|$%&#*+-/<=>?~^_λ!')
- local subsequent = initial + lexer.digit
- lex:modify_rule('identifier', token(lexer.IDENTIFIER, initial * subsequent^0 * P('#')^-1))
- -- Strings.
- local dq_str = lexer.range('"')
- local kw_str = lpeg.B(1 - subsequent) * ':' * subsequent^1
- lex:modify_rule('string', token(lexer.STRING, dq_str + kw_str))
- -- Comments.
- lex:modify_rule('comment', token(lexer.COMMENT, lexer.to_eol(';')))
- -- Ignore these rules.
- -- lex:modify_rule('longstring', P(false))
- lex:modify_rule('label', P(false))
- lex:modify_rule('operator', P(false))
- lexer.property['scintillua.comment'] = ';'
- return lex